TYLER POSEY: Whenever something good comes up that sounds like I could be part of the project, my manager and my agents send me in on it. I went in for the first audition and had great chemistry with the casting director and the people behind the desk, and they liked me. I went back for a callback and met Crystal Reed, we read together for a chemistry read, and it felt really good. Then, they brought us all in for the network test. There were probably at least 10 kids there, and the ones that clicked and were talking were me, Crystal, Tyler...